Lock unit



March 16 1926. H. H. CLAUSSEN LOCK UNIT Fried May 13, 1924 3 sheets-sheet 1 Hfaajje 1 @tto-ww?! March 16 1926. 1,576,574

H H. CLAUSSEN y Loox UNIT Filednay 13, 1924 s sheets-sheet 5 v www, l

Patented Mar. 16, 1926.

P,.Aqlfiilsi'r Loox UNIT.

Y Application filed May 13,

.To all whom it 11mg/ concern:-

Be it known that 1I, HERMAN PLCLAUS- snN, a citizen of the `United States, residing at'San Antonio, in the county of Bexar and 'State of Texas, have invented certain new` and useful Improvements,` in lLock Units, of which the Yfollowing is a specilication.v

This-invention rela-tes tov improvements in locksland more .particularly to a lock unitV adaptable to ordinarydoor locks, although it may find embodiment in a unitary structure. Y

The ordinary door lock comprises a latch mechanism with which the usual spindle and knobs are associated and through the manipulation of which the door may be lat'ched and unlatched, and, in Vaddition theretoa lock mechanism which is actuated through the medium of a key. vThis type of' lock has been in use many years and various makes or models thereof are quite expensive due to the necessity of providing both a latching and a locking means in a unitary structure. vNot only are they lock mechanisms of such locks expensive, but they are also open to the objection thatthey may be forced and the doors to which they are applied thus opened, surreptitiously. Furthermore, when such locks are so conj .structed that the knobs upon the ordinary spindle are iiXed or held against rotation when the lock is in locked position, it is pcssible'to force the lock by the application of rotative force to the knobs or spindle. In view of the foregoing, it is'one of the important objects of the present invention to provide a lock unit which may be quickly and readily installed in connection with any ordinary lock now in use and which will avoid the necessity of employing a locking mechanism separate and distinct from the latch mechanism, as is now the custom. Likewise, the invention contemplates, in this connection, the provision of a lock unit which, When installed, cannot be manipulated so as to force the lock and permit retraction of the bolt of the locking mechanism.

lAnother object of the invention is to provide a lock unit, applicable to any ordinary V1924. serial No. 713,058.

lock or latch'such as is employed upon oFFicE.

HERMAN Hi. oLAUssnN, or SAN ANTONIO, TEXAS.

doors, which unit will embody a handle member in the form of a knob housing the locking means which, through the use of'a key, 'may be so adjusted as to permit lof rotation of the lock spindle to retract the lock or latch bolt, may bev adjusted to Vpermit of use of the lock through the usual manipulation of the knob, and whichalso be adjusted to free the knob so that it will rotate freely independently of the spindle, thus preventing forcing of the lockthrough rotation of the spindle byapplication of rotative force to the knob.y j Q Another object of the invention, and an important one, is to provide a lock unit which may be placed uponthe market at a low cost and which may be readily installed by the purchaser'V thereof, in connection With any ordinaryflock of standard type, the lock unit of the present invention being designed to take the placeof the ordinary spindle.

and knobs which are associatedV with the latch mechanism of such a lock and serve as a highly efficient and more protective substitute for the lock mechanism already present in such a standard lock.

The lock embodyingthe present invention is designed more particularly for use in oiice buildings, hospitals, house'sypublic buildings, and the like, where it is desirable to provide for free entrance and exit from the room closed by the door to which the lock is applied, to likewise permit of secure locking of the said door, and, furthermore, to permit of locking of the door in a manner to positively preclude opening thereof.

Another object of the invention is to rovide a lock unit which may be adapte to locks which are already installed and associated with such locks regardless of the thickness of the door or the mechanism of the lock to which the unit is adapted,'and which unit will enable the' purchaser to 0btain all of the advantages of the ori inal lock and the other advantages out ined above. Y

In the accompanying dra-Win s: Y

Figure 1 is a view partly in si e elevation and partly in section illustrating the application of the lock unit of the present invention t0 an ordinary combined lock and latch already installed upon the door.

Figure 2 is a View in front elevation of the face plate of the unit, the knobs and spindle of the unit being removed and the parts being shown in s-ection.

Figure 3 is a vertical longitudinal sectional View in detail through the unit embodying the invention, the component parts of the lock mechanism being shown in the position which they will occupy when the mechanism is in locking condition.

Figure 4 is a horizontal sectional view on the line 4-4 of Figure 3, looking in the direction indicated by the arrows and illustrating the mechanism in the same position as shown in Figure 3.

-Figure 5 is a view similar to Figure 3, illustrating-the component parts of the lock mechanism in the position which they will ocjcupy when a proper key is inserted into the barrel of the mechanism for the purpose of actuating the mechanism to retract the bolt of the lock and thus unlock the door.

Figure 6 is a horizontal sectional view on the line 6-6 of Figure 5, looking in the direction indicated by the arrows, the mechanism being inthe condition shown in Figure 5.

Figure 7 is a View similar to t Figures 3 and 5 and illustrating the component parts of the mechanism in the position which they will occupy when the mechanism is adjusted for use during daylight or business hours and under which conditions the knob is rotatable to actuate and retract the bolt of the lock in the same manner in which the knob of an ordinary lock may be turned to actuate the latch bolt thereof.

Figure 8 is a horizontal sectional view on the line 8 8 of Figure 7, looking in the direction indicated by the arrows and illustrating the mechanism in the condition shown in Figure 7 Figure 9 is a vertical transverse sectional view taken on the line 9-9 of Figure 3 looking in the direction indicated by the arrows.

Figure 10 is a similar View taken on the line 10-10 ot Figure 3, looking in the direction indicated by the arrows.

Figure 11 is a vertical transverse sectional view on the line 11-11 of Figure 3, looking` in the direction indicated by the arrows.

Figure 12 is a diametric sectional view in detail on the line 1'2#12 of Figure 11, looking in the direction indicated by the arrows.

In Figure 1 of the drawings, there is illustrated, in a more or less general manner, a combined door latch and lock indicated in general by the reference numeral 1, this being the-usual combined latch and lock which 4is already installed in a mortise in the door 2 and comprising the usual spindle sleeve 3 having the rectangular opening 4 through which the ordinary spindle is fitted, the sleeve 3 carrying the usual finger 5 for coaction with the shank 6 of the latch bolt oi the mechanism, which bolt is indicated by the numeral 7. While the combined latch and'lock which is already installed in the door constitutes no part of the present invention and becomes useless when the present invention is installed, it is illustrated in a general way in Figure 1 and indicated by the numeral 8, so as to more clearly demonstrate the application of the lock unit of the present invention to an ordinary combined latch and lock. The installed lock likewise embodies the usual face plate 9 which is disposed against the inner :tace of the door 2, and the nume-ral 10 indicates the ordinary door Iknob which is the inner knob and which is mounted upon the inner end of the knob spindle which is indicated by the numeral 11 and which spindle constitutes an element of the unit embodying the invention. The face plate 9 is provided with the usual keyhole 12, and the casing of the latch and lock mechanism is likewise Vprovided with openings 13 through which, in ordinary practice, the lock key is to be inserted as well as through the opening 12, to actuate the locking mechanism. The unit embodying th-e invention includes, among other elements, a face plate indicated by the numeral 14, and this iace plate is disposed against the outer face of the door after removal of the usual outer knob and its spindle. rilhe face plate 14 is iormed with a vertically extending slot indicated by the numeral 15 and the slot is of such length that when the face plate is applied to the outer face ot' the door after removal of the outer face plate of the already installed latch and lock some portion of the length of the said slot will be located opposite the keyhole 12 and openings 13. The face plate 14 is Secured in place b v screws in the usual manner and additionally by a bolt constituting a part of the unit embodying the present invention and indicated in general by the numeral 16. This bolt comprises a shank 17 which is threaded at one end for the application thereto of a nut 18 and this end of the shank is designed to project through the keyhole 12 in the face plate 9. The shank at its opposite end, is formed with a lug 19 extending radially therefrom and of a thickness equal substantially to the diameter ot the shank, and outwardly of this lug with an integral head 2O which may be of some ornamental outline and of such vertical dimensions as to completely cover the slot 15 in all positions of adjustment of the bolt 17, depending upon the location of the keyhole 12 and the openings 13. 1t will be observed by reference to Figures 1 and 2, that the lug 19 engages in the slot 15 so that even should the securing screws for the face plate 14 be removed, the said plate could not be rotated about the spindle 11 in an attempt to disarrange the lock mechanism and open the` `die, member indicated in general by the numeral 21 and this knob, as illustrated in the several figures of the drawings, is in the form of a hollow shell 22 having' its outer end closed except for a circular opening 23 which is of a diameter toaccommodate the outer end of the key barrel of the lock mechanism, which will vpresently be described. The shell 22 at its inner end, is fitted rotatably and relatively snugly within a circular recess 24 formed in a boss 25 in turn formed upon the outer face of' the face plate 14. An opening 26 is formed `in the face plate 14 concentric to the circumferential wall of the'recess 24, and lugs 27 project dianietrically toward each other from the upper and lower sides of the said opening.v These lugs engage in diametric notches 28 formed in the inner end of a bushing 29 which is lexteriorly threaded at its'said end, as indicated by the numeral 30, a nut 31 being threaded onto this portion of the said bushing and tightened to bear against the inner face of the faceplate 14, as clearly shown in Figure 3, 'for example. The bushing 29 is provided at its outer end exteriorly with a circuinferentially extending flange 32 which is of'a diameter to more or less snugly fit within the bore of the shell 22 -of the knob, and threaded into the inner endv of the knob shell is a ring 33 which rotatably fits the body of the bushing and behind which Ithe said flange 32 of the bushing engages, as shown in said Figure 3. In this manner, the inner end of the knob shell is rotatably held within the recess 24, and the shell is likewise in this manner supported for rotation with relation to the said bushing 29. Y

The locking mechanism embodying the present invention includes two cylinders, one indicated in general by the numeral 34 and the other in general by the numeral 35, and a key barrel which is indicated in general by the numeral 36. The cylinders 34 and 35 are fitted into the bore of the shell 22 of the knob 21, the cylinder 34 being located next adjacent the closed outer end' of the said shell, and the cylinder 35 vbeing arranged immediately inwardly oii' the cylinder 34. rl`he cylinder 35 is formed with two oppositely located arcuate slots 37, the portion of the cylinder between the adjacent ends of the said slots constituting abutments indicated by the numeral 33, and the said slots being concentric to the axis of the said cylinder. Bolts 39 are fitted through openings' 4() formed in the bushing flange 32 and are fitted into sockets 41 formed in the said cylinder 35. The bolts 39 engage through the slots 37 in the cylinder 35, `as clearly shown infFigure 11 of the drawings, and constitute a rigid connection between the bushing 29 vand the cylinder "34, so that this cylinder is permanentlypheld against rotation. r1`lie cylinder 34 is formed with van opening 42 to which the vcylindrical key barrel 36 is rotatably fitted, and the barrelL is provided at its outer end with a circumferential flange 43 which abuts against the outer end of the said cylinder 34 and fits` snugly and rotatably within the openingv 23 inthe closed end of the handle 21. rlhe cylinder 35 is likewise formed with a cylindrical opening indicated by the numeral 44, which accommodates the inner end portion'ot the said spindle and the spindle `projects inwardly beyond the inner face of the said cylinder as shown in the several sectionalviews of' the drawings. Washers 45 are fitted onto the end of the key barrel 36,

and one of these washers engages the inner face ofthe cylinder' 35. A thiinble 46 is fitted onto the end of the said key barrel 36 and a pin 47 is driven diainetrically through the said thiinble and through the said end of the barrel, thus securing the thiinble to the said barrel. The inner end of the thiinble is formed with an opening 48, and a link 49 is rivetedV or otherwise secured as at 50, tor

the end of the spindle 11, as clearly shown in Figures 3 and 4, for example, of the drawings. The link 49 has a flat. portion projecting beyond the end of the spindle and through the opening 48 and into the inner end of the thiinble 46, and a lug 51 is stamped or otherwise formed from the wall of the thiinble 46` and is engageable by this portion of' the said link 49, the said fia-t portion of thesaid link, which is indicated by the numeral 52, being somewhat broader than the shank of the link so that when fitted into the thi-mble with its shank extending through the opening 48, the link will be prevented from being withdrawn from the thimble. The breadth of the said flat portion 52 of the link is substantially equal to the internal` diameter of the tliimble 46 and it will be understood that the thiinble, together with the barrel 36, may have relative rotative movement with respectto the knob spindle 11.v The lug 51l constitutes means for engagement against the broad-- ened portion 52 of the link 49 to effect rotation of the spindle 11 to retract the bolt of the latch and lock mechanism when the key barrel 36 is rotated thro-ugh the medium of a proper key, and on the other hand,

the limited movement which the said por.

usual longitudinally extending key slot 52 designed to receive a suitably warded key 53, the Wards ot' which key are designed to shift the tumblers of the two series associated with the cylinders 34 and 35 as will now be described.

The tumblers of one series are indicated in general by the numeral 54, and the tumblers ot the other-series in general by the numeral Each ot the tumblers 54 comprises two sections, one indicated by the numeral 5G and the other by the numeral 57, the sections 56 constituting' the locking sections o'lE the tuinblers and the sections 57 constituting the key-engaged sections ot the tumblers. The cylinder 8st is termed with A ing arranged within the openings and bearing at their outer ends against the said slide and at their inner ends against the outer ends of the tumbler sections 56. The tumbler sections 57 are slidably mounted in radial openings Gl formed in the key barrel 36 and at their outer ends are designed to abut against the inner ends ot the sections 56 when the key barrel is rotated to a position with its openings (31 in alinement with the openings 58 in the cylinder 34, the tumbler sections 5G being, at such time, projected into the openings (il, it the key is not inserted into the key slot FQ, through the medium o'l the springs GO.

The other tumblers comprising the series 55 embody, each, two sections, one indicated y the numeral 62 and the other by the numeral G3, and these two sections correspond to the single sections 56 of the tumblers of the series 54, In other words, the combined length of the tumbler sections 62 and G3 of each tumbler 55 is equal to the length of the corresponding tumbler section 56 of the tumblers 54. The said tumbler sections G2 and 63 are mounted in openings 64 formed radially in the cylinder 34 and springs 65 corresponding to the springs G0 are arranged within these openings and bear at their inner ends against the outer ends ot' the respective tumbler sections 62 and at their outer ends against a slide G6 which corresponds to the slide 59 heretofore described. The tumbler sections 57 are common to both series ot tumblers as will be apparent by reference, Jfor example, to Figures 5 and 8 of the drawings, and it will be observed by reference to these ligures that when a. suitably warded key is iitted into the key slot ot the key barrel 36, the tumbler sections 57 will all register at their outer ends with the circumferential surface of the key barrel, the tumbler sections 56 at such time likewise registering with the inner ends of the openings 58, and similarly, the tumbler sections 62 will register, at such time, with the said inner ends of the said openings. lhe manner ot functioning of the several tumblers will presently be explained in the description of the operation of the locking mechanism.

The cylinder is formed with a radially extending opening indicated by the numeral 67, and the key barrel 36 is formed with a correspondingly located opening 68 which is in registration with the opening o?, a tumbler pin 69 being slidably mounted in the said openings 67 and (S8, as clearly shown, tor example, in Figure 5 ot the drawings, and having its inner end projecting into the slot 52 tor engagement by one ol the wards ot the key. An opening 70 is formed radially in the wall ont the shell Q2 el the knob 2l and slidably mounted in this opening are tumbler sections 7l and 72, the section 72 lbeing located near the inner end of the opening and the section il. being located immediately outwardly ot and in endwise engagement with the said section 72. The other end of the opening is closed by a plug 78, and a spring 74 is arranged within the opening and bears at one end against the plug 7 3 and at its other end against the outer end of the said section 7l. A similar radial opening 75 is likewise, l'ormed in the wall ot the shell and slidably arranged therein isa tumbler` 7G, a spring 7 7 being arranged within the opening and bearing at one end against the enter end of the said tumbler and at its outer end `against a plug 78 which is tted into and closes the outer end of the said opening 75. It will be observed that the tumbler section 72 and the tumbler 76 are both so located that either may be brought into alinement with the tumbler 69, as will be evident by a comparison of Figures 8 and 8 ot the drawings and by reference t0 Figure 10 of the drawings.

ln order that one may determine when the cylinder and the knob 2l are in such position as to provide viter insertion of the key to unlock the mechanism, as lor eX- ample, in the position otl the parts illustrated in Figure 3 ot' the drawings, a small plunger 79 is slidably mounted in an opening 80 formed vertically in the boss 25 at the lower end oit the said boss, and the lower end olI this opening is closed by a plug 8l and a spring 82 is arranged within the opening and bears at its lower end against the plug; and at its upper end against the lower end ot the plunger, the said upper end of the plunger being son'iewhat pointed or tapered as indicated by the numeral 83 and being adapted to project into a shallow socket 8l formed in the outer side ol the shell o'tl the knob 2l. It will be evident at this point that when the knob isfrotated, and it reaches will, together, give sensible and audible indication to the user that the knob is in proper positionfor the insertion of the key. As heretofore stated, Figures 3 and 4t of the drawings, illustrate the positions occupied by the several component parts ofthe mechanism when the lock is in locking condition and by reference to these figures and a comparison ofthe two, it will be observed that at this time, the sections 56 of the tumblers of the series 54 are engaged both in the openings 58 and in the openings 61 so that the key barrel 36 is held fixed with relation to the cylinder 34, and the barrel cannot be turned. Likewise, at this time, the tumbler section 72 will lie within the outer end of the opening 67 in the cylinder 35 with its outer end in registration with the circumferential surface of the cylinder, and the tumbler section 71 will, in asimilar manner, have its inner end located flush with the inner surface of the wall of the shell 22 of the knob 21. Under these conditions, therefore, it is impossible to rotatethe key'barrel 36 and thereby effect rotation of the spindle llto retract the lock bolt, and likewise, the knob 21 isunrestrained andfreely. rotatable so that lits rotation cannot by vany possibility so connect the parts as to permit of rotation of the spindle 11.`

s When it -is Vdesired to open the door to which the locking mechanism is applied, a suitably warded key, such as the key shown in Figure 5 of the drawings, is inserted into the slot 52 of the lkey barrel 36 and upon insertion of such a key, the tumblers 54 comprising; the` sections 56 and 57 will be so shifted as tobring the meeting ends ofthe respective sections intoposition flush. with the outer `surface of the key barrel, and likewise, the tumberpin 69 will be so shifted as tomove the tumbler section 72 into position within the inner end of the opening 70 so that the end of this section 72 and the tumbler 69 will be flush with the outer surface of the cylinder A35. The key may then be rotated toward the right, thusfrotating the key barrel and imparting rotary motion to the spindlell so as to retract the lock or latch bolt. `The key may then be withdrawn, after the key barrel' has been rotated to its normal position by the action of the usual spring which constitutes a part of the combination latch Aand lock originally .installed upon the door, said spring, however, not being illustrated Las it constitutes no part of the present invention. Upon withdrawal of the key, the arts will reassume the position shown in igure 3 of the drawings.y Y y When theparts are in the position shown in Figure 3, it will be evident the tumbler section 72 will occupy the outer end of the opening 67, so that lthe opening will ,be closed and consequently the tumbler 76 cannot be projected into theopening in therotation of the knob andthe knob may be freely rotated without any likelihood of rotating the yspindle ll. These same conditionsprevail `when the key is inserted as shown in Figures 5 and6.` v f .It is, of course, desirablethat the mechanism becapable ofadjustment so ythat the spindle 11 may be actuated through rotation of the handv knob 2l, inasmuchv as the unit `intended for employment in oiiice buildings,

stores and various establishments where-it is desired to lock the doors after business hoursrbut, at the Sametime, admit of ready entrance and eXit by way of the doors during business hours. This may be accomplished by inserting thekey intothe barrel, when the parts are in the position' shown in Figure 3, and then rotating the barrel, throughV the medium of the key, toward the left, tob'ring the opening 67 opposite the opening 7 5, and

thenretracting the keysol as--to permit the tumbler 7 6 to enter the outer end ofthe said f opening 67,asfshown in Figure 8 of the drawings. VThis serves to connect the knob ywith the cylinder 35 and, inasmuch as the cylinder is in turn, connected with the key,-

barrel, rotative movement of the knob will effect rotation of the spindle 1l. In rotating the knob, its movementv will be limited 'by the engagement-of the abutment portion 38 of the cylinder 35, with the bolt 89. In order lto read-just the mechanism so that it will lock the door, it is only necessary to-reinsert the key, with the partsv in the position shown in Figures-7 vand 8 ofthedrawings, vwhich will effect adjustment: ofthe tumbler sections 56 and 57 to the position shown in Figure',

kand adjustment of the tumbler69 to such position-thatl the'inner end'of the tumbler A7f3-will be located flush withthefinner surface of the knob shell 22, and then rotate thekey barrel and the parts associated therewith to theright until the opening 70 is in registration, atitsinner end withthe outer end ofthe opening67 as shown in Figure .5, whereupon ,the key may be withdrawn and Vthe gparts` vwill assume the locking position shownin Figures 3 and 4. i

i Having thus described the invention, what Iiclaimis: 1'. Al `.lock unit applicable lto the latch mechanism ofjafn installed combination door tutingf .a substitute for the spindlefof fthe latch, mechanism, Y av fixed tumbler 'cylinder jwith relation to which thefspindle is rotatlatch and lock, ycomprising a spindle constiisc dle, a knob rotatable upon the first mentioned cylinder, and key controlled means operable to lock the key barrel with the first.

mentioned cylinder' and permit rotation of the knob and also operable to disconnect the key barrel from the said cylinder and lock the knob and second mentioned cylinder for rotation in unison.

2. A lock unit applicable to the latch mechanism of an installed combination door latch and lock, comprising a spindle constituting a substitute for the spindle of the latch mechanism, a fixed tumbler cylinder With relation to Which the spindle is rotatable, a key barrel rotatable in the cylinder', operative connection between the key barrel and the said spindle connecting the spindle with the barrel for rotation therewith in one direction of rotation of the said barrel and permitting limited rotation of the spindle independently of the barrel. a cylinder rotatable with the spindle, a knob rotatable upon the first mentioned cylinder, and key controlled means operable to lock the barrel with the said first mentioned cylinder and permit the rotation of the knob, and also operable to disconnect the key barrel from said cylinder and lock the knob and second mentioned cylinder for rotation in unison.

3. A lock unit applicable to the latch mechanism of an installed combination door latch `and lock, comprising a spindle constituting a substitute for the spindle of the latch mechanism, a fixed tumbler cylinder with relation to which the spindle is rotatable, a key barrel rotatable 1n the cylinder and operatively connected with the said spindle, tumblers associated with the said barrel and the said cylinder and key-shiftable to prevent and permit rotation of the key barrel with relation to the cylinder, a cylinder rotatable with the spindle, a tumbler associated with the second mentioned cylinder, and a knob rotatable upon the first mentioned cylinder, the tumbler of the second mentioned cylinder coacting,` with the knob to connect the knob with the said second cylinder and also disconnect the same therefrom. y

4. A lock unit applicable to the latch mechanism of an installed combination ldoor latch and lock, comprising a spindle constituting a substitute for the spindle of Ithe latch mechanism, a fixed tumbler cylinder with relation to which the spindle is rotatable, a key barrel rotatable in the cylinder and operatively connected with the said spindle, a key-actuated tumbler associated with the said barrel and said cylinder and normally assuming a position locking the key barrel with the cylinder and adjustable through the insertion of a proper key into the barrel to permit of rotation of the key barrel with relation to the said cylinder, a second cylinder rotatable with the key barrel, a knob freely rotatable upon the first mentioned cylinder and enclosing the same and the second mentioned cylinder and the key barrel, and av tumbler associated with the said knob and with the second mentioned cylinder and adjustable through the insertion of a proper key into the said barrel, to permit of free rotation of the key barrel independent of the knob and likewise provide for lotation of the key barrel with the said kno 5. A lock unit applicable to the latch mechanism of an installed combination door latch and lock, comprisingY a spindle constitutinga substitute for the spindle of the latch mechanism, a fixed tumbler cylinder with relation to which the spindle is rotatable, a key barrel rotatable in the cylinder and operatively connected with the said spindle, a second cylinder rotatable with the said key barrel, a knob freely rotatable with relation to the first mentioned barrel, the said knob enclosing` the said cylinders and the barrel, and key-actuated tumbler means for selectively connectii'lg the knob and said second mentioned cylinder; locking the barrel with the first mentioned cylinder and freeing' the knob from the second mentioned cylinder; and, freeing the key barrel from the said first mentioned cylinder.

6. A lock unit applicable to the latch mechanism of an installed combination door latch and lock, comprising a spindle constituting a substitute for the spindle of the latch mechanism, a supporting' plate for attachment to the doorl in which the said combination door latch and lock is installed, a bushing fixed With relation to the said supporting,` plate and having an opening to accommodate the said spindle, a tumbler barrel supported by the said'bushing in spaced relation thereto and thus held in a relatively fixed position, a knob freely rotatable upon and with relation to the said bushing and the said cylinder, a key barrel rotatably mounted in the said cylinder, a cylinder rotatable With the key barrel and housed Within the knob beside the first mentioned cylinder, operative connection between the key barrel and said spindle, and key-actuated tumbler means for selectively connecting the knob and second mentioned cylinder; locking the key barrel with the first mentioned cylinder and freeing the knob from the second mentioned cylinder; and, freeing the key barrel from said first mentioned cylinder.

7. A lock unit applicable to the latch mechanism of an installed combination door latch and lock, comprising' a spindle constituting a substitute for the spindle of thc latch mechanism, a supporting' plate for aftaehment to the door in Which the said combination door latch and lock is installed, a bushing fixed With relation to the' said supporting plate and havingcan 'opening Vto accommodate the said spindle, a tumbler barrel supported by the said bushing' in spaced relation thereto and thus held in a relatively fixed position, a .knob freely rotatable upon and with relationto the said'bushing` and the said cylinder, a key barrel rotatably mounted in the said cylinder, a cylinder rotatable with the key barrel and housed Within the knob beside the first mentioned cylinder, operative connection between the key barrel and said spindle, and key-actuated tumbler means for selectively connecting the knob and second mentioned cylinder; lockinp; the key barrel with the first mentioned cylinder' and freeing` the knob from the second mentioned cylinder; and, freeing the key barrel from said first mentioned 'cylinder, the said tumbler means including a tumbler associated with the second mentioned cylinder and exten-ding` through the key barrel into the key slot therein, tumbler seats in the'knob at spaced points in the circumferencc thereof in circumferential alinement with the said tumbler of the second mentioned cylinder, one-piece tumbler in one of said seats adapted to enter the seat for the first mentioned tumbler to lock the knob and second mentioned cylinder for rotation in unison, and a tumbler in the other seat in the knob comprising sections proportioned, in all positions of adjustment of the first mentioned tumbler, to permit of rotation of the knob with relation to the said second mentioned tumbler.

8. A lock unit applicable to the latch mechanism of an installed combination door latch and lock, comprising a spindle constituting a substitute for the spindle of the latch mechanism, a supporting plate for attachment to the `door in which the said combination door `latch and lock is installed, a bushingfixed with relation to the said supporting plate and having' an opening to accommodate the said saindle, a tumbler barrel supported by the said bushing in spaced relation thereto and thus held in a relatively fiXed position, a knob freely rotatable upon and With relation to the said bushing` and the said cylinder, a key barrel rotatably mounted in the said cylinder, a cylinder rotatable with the key barrel and housed Within the knob beside the first mentioned cylinder, operative connection between the key barrel and said spindle, and key-actuated tumbler means for selectively connecting vthe knob and4 second mentioned cylinder; 'locking' the key barrel with the first mentioned cylinder and freeing the knob from the second mentioned cylinder; and, freeing the key barrel from said first mentioned cylinder, the said tumbler means including a tumbler comprisimgsections associated with the key barrel and first mentioned cylinder and normally locking the key barrel with A bination `door latch and lock is installed, a

bushing fired with relation to the said supporting plate and having an opening to accommodate the said spindle, a tumbler barrel supported by the said bushing in spaced relation thereto and thus held in a relatively fixed position, a knob freely rotatable'upon and With relation to the said bushing and the said cylinder, a key barrel rotatably mounted in the said cylinder, a cylinder ro tatable with the key barrel and housed Within the knob beside the first mentioned cylinder, operative connection between the key barrel andY said spindle, and key4actuated tumbler means for selectively connecting the knob and second mentioned cylinder; locking the key barred With the first mentioned cylinder and freeing the knob from the sec ond mentioned cylinder; and, freeing the key barrel from said first mentioned Cylinder, the said tumbler means including a tumbler comprising' sections associated with the key barrel `and first mentioned cylinder and normally locking the key barrel with relation to the first mentioned cylinder and key-shiftable to-position to permit of rotation of the said key barrel with relation to the said first mentioned cylinder, and further comprising` a tumbler associated With the second mentioned cylinder and extending through the key barrel into the key Slot therein, tumbler seats in the knob at spaced pointsv in the circumference thereof in circumferential alinement With thesaid tum-v y bler of the second mentioned cylinder, aonepiece tumbler in one of lsaid seatsV adaptedtol enter the seat for the first mentioned tumbler to lock the knob and second mentioned cylinder for rotation in unison, and a tumbler in the other seat in the knob comprising sections proportioned, in all positions of adjustment of the first mentioned tumbler, to permit of rotation-of the knob With relation to the said second mentioned tumbler.

10. A vlock unit applicable to the latch mechanism of an installed combination door latch and lock, comprising a spindle constituting a substitute for the spindle of the latch mechanism, a fixed tumbler cylinder with relation. to which the'spindle is'rotatable, a key barrel rotatable in the cylinder 1 and operatively connected with the said spindle, tumblers associated With the saidf barrel and the said cylinder and key-shiftable to prevent an'dpermit rotation. of the key barre] with relation to the Cylinder', a ond cylinder and also disconnect the same cylinder rotatal'ile with the spindle, a tnmlllei'efi'on'n :ind means for indicating When bler associated with the second. mentioned the knob is in position for insertion of die cylinder, a knob rotatable. upon the first key to properly aetuate the look mechanism. 5 mentioned Cylinder, tlie tumbler of the see- In testimony whereof I affix my Signature.

ond mentioned Cylinder eoucting with the HERMAN H. CLAUSSEN.

knob to connect the knob with the said seo- [n s l 

